Although fairly hard 6 5 7 5 this material is also brittle and may cleave or fracture easily.
Light blue stone.
Though more common as a pale yellow stone sillimanite can have pale blue hues like a light tone aquamarine.
The most popular color.
This blue stone ranges in shade from light blue green blue to deep blue.
There are 19 558 light blue stone for sale on etsy and they cost 12 46 on average.
It has a hardness of 7 to 7 5 on the mohs scale making quite suitable for jewelry wear.
While colorless in pure form quartz also occurs as blue stones known as dumortierite quartz.
Most dark blue specimens have been dyed.
This blue crystal gets its color from heavy.
Iolite is known to exhibit pronounced pleochroism often displaying violet blue yellow gray and light blue all in the same stone depending on the angle from which it is viewed.
Lapis lazuli medium rich blue color larimar this stone is a cloudy white and blue mixture in color moonstone this.
The color of this blue gem is photosensitive and fades in intensity with too much exposure to sunlight.
Sapphire is a gem variety of the mineral corundum when corundum is reddish blue to violet blue it is known simply as sapphire corundums of any other color except red which is ruby are known as fancy sapphire.
This makes it a challenge for lapidaries and a risky choice for jewelry.
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Iolite is a transparent gemstone quality form of the mineral cordierite.